2-12-08Lec11

# 2-12-08Lec11 - Lecture 11 Lecture 11-1 Ideal vsReal Battery...

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Unformatted text preview: Lecture 11 Lecture 11-1 Ideal vsReal Battery Energy conservation Work done by battery is equal to energy dissipated in resistor 2 2 dW iRdtoridtiRd iR t ε ε = = ∴ = • Ideal battery:no internal energy dissipation EMF ε = terminal voltage V • Real battery: internal energy dissipation exists dW> i 2 Rdt or ε > iR=V Lecture 11 Lecture 11-2 Real Battery = Resistors in Series eq R rR ∴ =+ h The current through devices in series is always the same. iriR ε − − = ≡ R eq i ε eq iR ε − = , i R r ε ∴ = + internal resistance 1 2 3 ... eq R R R R = + + + For multiple resistors in series: terminal voltage b a V V ir R R r ε ε − =− = + Lecture 11 Lecture 11-3 Resistors in Parallel ≡ 11 2 2 3 3 iR iR iR ε = = = ( ) 1 2 3 eq ii iR ε = + + 1 2 3 1 2 3 1 1 1 1 eq eq or R R R R R R R R ε ε ε ε ∴ + + = = + + Devices in parallel has the same potential drop ••• L R A ρ = Generally, 1 1 i eq i R R = ∑ Lecture 11 Lecture 11-4 Kirchhoff’sRules Kirchhoff’sRule 1: Loop Rule x When any closed loop is traversed completely in a circuit, the algebraic sum of the changes in potential is equal to zero. i loop V Δ...
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## This note was uploaded on 04/07/2008 for the course PHYS 241 taught by Professor Wei during the Spring '08 term at Purdue University.

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2-12-08Lec11 - Lecture 11 Lecture 11-1 Ideal vsReal Battery...

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